[FFmpeg-devel] [PATCH] avcodec/libkvazaar: Set default ratecontrol algorithm for libkvazaar

[Linjie Fu]

On Thu, Dec 10, 2020 at 2:09 PM Joose Sainio <joose.sainio at tuni.fi> wrote:
>
> The standalone version of Kvazaar sets a default ratecontrol algorithm when
> bitrate is set. Mirror this behaviour.
>
> Signed-off-by: Joose Sainio <joose.sainio at tuni.fi>
> ---
>   libavcodec/libkvazaar.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/libavcodec/libkvazaar.c b/libavcodec/libkvazaar.c
> index 9032547678..68ce7ad58c 100644
> --- a/libavcodec/libkvazaar.c
> +++ b/libavcodec/libkvazaar.c
> @@ -95,6 +95,9 @@ static av_cold int libkvazaar_init(AVCodecContext *avctx)
>       cfg->target_bitrate = avctx->bit_rate;
>       cfg->vui.sar_width  = avctx->sample_aspect_ratio.num;
>       cfg->vui.sar_height = avctx->sample_aspect_ratio.den;
> +    if(avctx->bit_rate){
> +        cfg->rc_algorithm = KVZ_LAMBDA;
> +    }
>
>       if (ctx->kvz_params) {
>           AVDictionary *dict = NULL;
>
>
Looks reasonable,  fixed the encoding failure if explicitly setting
bitrate through "-b:v 3M".
And the result matches the behaviour of -kvazaar-params "bitrate=3000000".

- linjie